Concrete-molding apparatus



- INVENTO I Nov. 6, 1928. w. KLEITZ CONCRETE MOLDING APPARATUS Filed Sgpt. s, 1

Patented Nov. 6, 1 928.

UNITED STATES WILLIAM KLEITZ, OF ALBANY, YORK.

CON CRETE-MOLDING APPARATUS.

Application filed September a, Serial No. 217324 This invention relates to concrete forms and more particularly to forms for produc ing hollow concrete floors or ceilings.

An object of the invent-ion is to provide new, simple, and eflicient apparatus for molcb ing hollow concrete floors.

. Othenfeaturcs and objects of the inven- -tion will become apparent by reference to the following detailed-description and accompanying drawings in which,

Fig. 1 shows an end view and partial isometric perspective of the form and floor in threestages of erection and completion, and

Fig. 2 shows a modifiedarrangement of the forms.

Referring now to the drawings, 10 indicates the vertlaalsupports which may be of either wood or metal, the dimensions and spacing of which may be proportioned according to the loads to be carried thereby. A horizontal support of the material similar to supports 10 is indicated at 11. In order that the concrete may be poured in such a manner as to produce hollow flooring, use is made of a pair of forms, one of which is indicated at 12. Such form is preferably of metal of a gage heavy enough to withstand the pressure of the concrete- It may be of any size andlength desired for the purpose in view. As shownin the drawings, the top of the form 12 is provided with a flange 13 while the bottom thereof is also provided with a flange 14 the purpose of which will hereinafter be explained in detail. That portion of form 12 indicated by the expanse A may be continuous, i. e. formed as an integral part of the form as shown in Fig. 1 or may be composed of separable portions as indi cated in Fig. 2. By such separation of that portion of the form at any point or points the space indicated at B can be reduced to a comparatively narrow width resulting in a narrower piece of form indicated at 30, such piece of form being described in detail hereinafter. Moreover this arrangement will result in additional strength for the completed structure. Use is also made of a second form 15 similar in shape to form 12, being provided with upturned flange 17. 12 and 15 are so positioned that their lower edges overlap whereby the flange 14: rests against the upper face of the bottom extension of form 15 while the flange 17 rests against the underside of the bot-tom surface of form 12. These flanges serve the purpose joint when the- ,In order that the forms so assembled may in they complete formation of a hollow ficiently hardened, the forms 12 and a flange 16 and an In practice the forms of strengthening the edges of the forms and also the further purpose of providing a good forms are assembled. for use.

be spaced from the flooring, use is made of metal saddles 18 of triangular shape and also metal saddles 19 partially supportedby reinforcing bars 2-0 as shown. Use is also made of the usual wire mesh reinforcing ,21,

such reinforcing being adapted to'remain permanently in the concrete to add strength thereto. H

In order that the forms when assembled may be held in spaced relation toeach other, use is made of Spreaders 22 of wood or metal, such spreaders being adapted to fit inside of the form and to hold it in shape against the pressure of the concrete. Such spreaders may be spaced at any desired intervals along the length of the forms. Use is also made; of reinforcing rods 25to aid in thestrengthening of'the concrete and also to further aid space in the concrete floor. A detailed description of the use of these rods is'included hereafter.

Having explainedand described the essential parts of theinvcntion, the operation is follows. The saddles 18 and 19 to her with the reinforcing rods 20 and the wire mesh 21 are positioned as shown in the drawnits. 11 position whereby thelower edg 3 thereof verlap each other. In suchposit-ion the orms are properly spaced by means of the pread'ers 22 and are held in such spaced relation by means of suitable wire around. With the forms in place the reinforcing rods are positioned as shown in the drawings, that is, witl1 their ends upturned to conform to the shape of the form... Concrete may then be poured to a height approximately level with the top of the form. After the concrete so poured has become suf- 15 may be removed byfirst removing the spreaders 22 and then withdrawing 'first the form 12 and thentll form 15. At this time it is well D to note that the tapered shape of the members i to eachother. The dimension A must be less binding there- The forms 12 and 15 are next placed than dimensions B and C and the dimension C must not be more than that indicated at B.

, vious'lypoured concrete, the reii'iforcingrods 25 are bent'over the void formed by the upturned edges of forms 12 and'lo and these suitable reinforcement are secured together by'any rods or any other crossing the void means to develop the full strength of the same as continuous members, afterwhich the form '30 is secured to such joined rods in any desiredmanner, such asby wire tying. With this form-in placethe void may now be filled with concrete and the finishing surface of, a finer material applied immediately thereafter.

While the preferred form has been illustrated and described in detail, it will be V evident to those shilledin the art that modifications maybe made without departing from the invention as defined in the appended. claims.

I claim:

1. Apparatus of the character described comprising a pair ofsimilarly shaped sec-. tionshaving sloping bottoms, vertical risers and sloping tops having a portion thereof, ex tending at an angle from the remainder thereof and means for spacing said sections whereby the bottoms thereof overlap each other.

2. Apparatus of the character described comprising a pair of similarly shaped op positely disposed sections having overlapping bottoms and having angularly extendingtop edges whereby a relatively large space is afforded between said top edges.

3. Apparatus ofthe character described comprising a pair of similarly shaped, oppositely disposed sections having sloping overlapping bottoms, means for supporting saidsections at the point of overlap, means for supporting the outer edges of the botrality of substantiallyhorizontal rods on each side of sai.dcentral opening and having upstanding ends adapted to be bent over the opening leftin the concrete by the removal of said sections, a flat form adapted to close said opening and to'prevent poured concretefrom entering the void formed'by said sections and ineans'for securing said flat form-tosaid bent;

over rods.

5. Themethod' of molding'hollow concrete flooring which comprises setting up a pair of forms having overlappingbottom edges and top edges spaced apart, pouring concrete around said forms to a height approximately level withthe top edges of said forms, simultaneously imbedding in said concrete on eacl side of said forms, a plurality of substantially horizontal rods having upstanding ends, permitting said concrete to harden, re-

moving said forms through the opening in the concrete providedby the spaced top edges of the form,lowering a'fiat'form into the void so formed, bending th-eupstanding ends of said rods across the opening in the cone etc, securing said flat form to said rods, pouring concrete into saidopening and onto said flat form and finishingthe flooring.

6. Apparatus of the character described comprising a plurality of formshaving slopingbottoms, verticalrisers, sloping tops composed of overlapping sections one of which has a portion extending at an angle from the forms whereby the bottoms thereof overlap each other.

In testimony whereof, I have signed my naine'to this specification.

wILLiAM itnn ra.

I remainder thereof and means for spacing said 

